Your network contains an internal network and a perimeter network. The internal network contains an Active
Directory forest named contoso.com. The forest contains a Microsoft Exchange Server 2010 organization.All of
the domain controllers in contoso.com run Windows Server 2012.
The perimeter network contains an Active Directory forest named litware.com.
You deploy Microsoft Forefront Unified Access Gateway (UAG) to litware.com. All of the domain controllers in
litware.com run Windows Server 2012.
Some users connect from outside the network to use Outlook Web App.
You need to ensure that external users can authenticate by using client certificates.
What should you do?
More than one answer choice may achieve the goal. Select the BEST answer.

A.
Enable Kerberos constrained delegation in litware.com.

B.
To the perimeter network, add an Exchange server that has the Client Access server role installed.

C.
Enable Kerberos delegation in litware.com.

D.
Deploy UAG to contoso.com.